2. Elaine Marshall & Family

The 48th wealthiest woman in the U.S., Elaine Marshall inherited her billions from her late husband, J. Pierce Marshall in the form of a 14.6 percent stake in Koch Industries. The funny thing is no one knew about her fortune until Bloomberg named her the 4th richest woman in the U.S. in 2012.

Fun fact: She's the daughter-in-law of Anna Nicole Smith, who was married to Elaine's late father.

3. Jorn Rausing

Swedish billionaire Jorn Rausing may have inherited his $5.2 billion fortune from his late mother, Birgit, but he hasn't used that as an excuse to escape the working world. Rausing sits on the board of Tetra Laval, the company his grandfather founded that is responsible for the Tetra Pak –– the special boxes used to store milk and juices without refrigeration, according to Forbes.

Fun fact: A plan to kidnap Jorn by pro-Palestinian terrorists was thwarted in 1989.

5. Eduardo Hochschild

Peru's fourth richest man, Eduardo Hochschild owed his wealth to his great uncle, who founded hte wildly successful Peruvian gold and silver mining company in 1911, according to forbes. Hochschild studied science in the U.S. at Tufts University and first joined Hochschild Mining in 1987 as a safety assistant.

Like another billionaire heir, Jorn Rausing, Hochschild survived a kidnapping. A gunman killed his father and Hochschild was held captive for six days before his release.